八上数学11.1与三角形有关的线段 名师精讲2

https://v.qq.com/txp/iframe/player.html?vid=w0160r0h49v&width=500&height=375&auto=0

https://v.qq.com/txp/iframe/player.html?vid=n03476v5av1&width=500&height=375&auto=0

名师答疑解惑直播https://v.qq.com/txp/iframe/player.html?vid=r0313f32bh8&width=500&height=375&auto=0

复制 http://t.cn/RKSA8ba 打开下载配套的课件，点阅读原文看全部教学视频